So lets say you have 2 Roamio Plus/Pros...each in a different room but the rooms are very close...will the remotes conflict and control each or do they each use their own "frequency/address/whatever" so it will only work for the one it came with?

i know that exists...i was just curious as these new remotes were RF if they came "paired" to that specific box already or not...

They automatically pair themselves when you first use the remote. I would do one at a time (ie one box on and one box off) during the initial pair ... Then you're be fine thereafter. They can be easily switched to IR if you want too.

A friend tried this and said assigning the remote address didn't work. Because of the RF, the TiVo button kicks you back to the main menu. Before you would just cover the IR blaster.

If you push-and-hold pause first, then the tivo button, you don't have this issue. The remote seems to into the proper mode (the light comes on and stays on), and then you can click the number you want, and the light flashes then goes out (so far so good), but clicking "right" does not set the tivo to change to showing that it will receive only that remote code.

Luckily for me, I only have one Roamio, but I do have 2 other series 2's that I'm trying to make sure don't get messed up.

I don't think you have to do anything for a Roamio to work with IR. I setup my Roamio (basic model) using it's RF remote, however my other TiVos IR remotes also worked until I changed the remote address on my Roamio.